LV11706B - Cylinder lock and key combination with a guiding profile ridge in the lock - Google Patents

Abstract

A cylinder lock and key combination, wherein the lock comprises a side profile ridge (60) disposed in the key slot (53) and having a relatively shallow recess (61), in which a projection (55) on a side tumbler (54) is vertically movable, and a continuously extending edge portion (62). The key has a relatively shallow coded groove (17), which cooperates with the side tumbler projections (55) of the lock, and a rectilinear, deeper profile groove (16), into which the edge portion (62) of the side profile ridge fits. This unitary edge portion secures a good guidance of the key when the latter is inserted into the lock.

Description

1 I. LV 11706

CYLINDER LOCK AND ΚΕΥ COMBINATION WITH

A GUIDING PROFILĒ RIDGE IN THE LOCK

BACKGROUNP OF THE INVENTION 1. Field of the Invention

The present invention relates to a cylinder lock and key combination. The invention also relates to a corresponding key, a key blank for manufacturing such a key, and a corresponding lock. 2. Description of the Related Art

Lock and key combinations of the kind indicated above are generally knovn, e.g. from WO87/04749 (Widen Innovation AB). In the knovn lock, the profilē ridge in the key plug is dis-continuous in the region of each side tumbler finger. Thus, recesses or openings extend from the associated cavity (vhere the side tumblers are mounted) transversely into the key slot. In this way, each side tumbler projection (in the form of a finger vhich is approximately as long as the vidth of the side profilē ridge) is displaceable vertically and/or rotationally vhile continuously engaging the code pattern of the key blade vhen the latter is inserted into the key slot of the lock. Hovever, such recesses or openings form interruptions in the profilē ridge, so that the guiding action of the latter is impaired. Especially in the case of flat, thin key blades this may cause the front end of the key blade to strike against the edge portion of such a recess or opening upon insertion of the key, in particular if the key blade is inserted somevhat obliquely into the key slot. A further disadvantage vith the previously known lock and key combination is that interruptions in the profilē edge make the side tumbler directly accessible to a vider range of lockpicking tools.

SUMMARY OF THE INVENTION

The object of the present invention is to achieve a cylinder lock and key combination of the kind indicated above 2 ιι having an improved guidance of the key in the lock and a higher security against picking.

This object is achieved according to the present in-vention by providing a cylinder lock and key combination, vherein said cylinder lock comprises a shell; a cylinder key plug rotatably mounted in said shell and including at least one cavity therein; a key Slot extending longitudinally in said cylinder key plug for receiving said key; at least one side profilē ridge disposed in said cylinder key plug and partially defining said key slot, said side profilē ridge including a recess; and at least one side tumbler which is movably mounted in an associated cavity in said cylinder key plug and having a projection which cooperates with said key, when said key is inserted into said key slot. Further, the key comprises an elongated, substantially flat key blade extending betveen two planar side surfaces, said key blade being insertable into said key slot and having at least one rectilinear side profilē groove corresponding to said side profilē ridge and extending along an entire length of said key blade in one of said planar side surfaces; at least one coded recess in said one side surface adjacent to said side profilē groove, said coded recess cooperating with said projection upon insertion of said key into said key slot of said cylinder lock.

The side profilē groove of said key is deeper than said coded recess or recesses adjacent thereto, the depth being cal-culated transversely to said one side surface. The cavity in the key plug communicates with the key slot of the lock via said recess in said profilē ridge while leaving a continuously extending edge portion of said profilē ridge, said edge portion guiding said key blade, upon insertion thereof into said key slot, in a region of a bottom of said side profilē groove. Furthermore, said projection of said side tumbler extends transversely into said recess in said profilē ridge, upon inserting said key blade into said key slot of the lock, so as to make contact with said coded recesses adjacent to said continuously extending edge portion of the side profilē ridge of the lock. 3 !]. LV 11706

The unitary edge portion of the side profilē ridge will thus secure a good guidance of the key blade in each position while inserting the same into the lock, even if the key is subjected to oblique forces.

Moreover, the unitary edge portion will protect the side tumblers located inside thereof, especially the projections extending transversely therefrom, so that the side tumblers or the side tumbler projections are not accessible from the side in the region of the side profilē ridge.

The recesses of the side profilē ridge thus have a limited extension transversely (up to the unitary edge portion) but form openings upvards and/or downwards, so that the side tumbler portions or projections may contact the coded recesses of the key above and/or below the side profilē ridge. The side tumblers may be rotatable vithin limits in the associated cavity, so that said portion or projection (e.g. in the form of a finger) will pivot back and forth, but they also must be movable elevationally, so that the finger portion or projection may follow correspondingly coded recesses of the key, said coded recesses being e.g. wave-like. The side tumblers may alternatively be non-rotatably mounted in the cavities, possibly with side projections which are irregularly dis-tributed along the longitudinal direction of the cylinder key plug (cf. US 5,067,335, Bo Viidēn) . Also, simpler embodiments with centrally located portions or projections on each side tumbler are conceivable.

The side tumblers may lock the cylinder key plug against turning in the shell either individually or in cooperation with at least one side bar or the like.

According to a further aspect of the invention, the side profilē groove in the key is undercut at at least one groove surface, wherein the profilē ridge of the key plug forms a corresponding tongue in said continuously extending edge portion, said tongue filling up the undercut portion of the side profilē groove. Hereby, the edge portion will have a greater extension elevationally and will therefore secure a stili higher security against picking, since manipulation of the side tumblers from the side is made even more difficult. 4 ll·

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be explained further below with reference to the appended drawings illustrating two embodi-ments.

Figurē 1 is a side view of the key according to a first embodiment of the invention;

Figurē 2 is a cross section of the key along the line II - II in Figurē 1;

Figurē 3 is a ccross section through the lock in the region of a side tumbler;

Figurē 4 is a section along the line IV - IV in Figurē 3;

Figurē 5 is a cross section corresponding to Figurē 3 with an inserted key; and

Figurēs 6-10 are corresponding views as those of Figurēs 1 - 5 of a second embodiment of the invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Figurēs 1-5 illustrate a first embodiment of a lock and key combination according to the invention.

The key illustrated in Figurēs 1 and 2 comprises a substantially flat key blade 10, which extends substantially in a central planē A between two mutually parallel side surfaces 11 / 12. An upper edge portion 13 is somewhat thinner than the rest of the key blade 10. In the side surface 12 (to the right in Figurē 2) the key blade 10 has a conventional "open" profilē groove 14, and in the other side surface ll (the left in Figurē 2) the key blade has a conventional profilē groove 15 as well as a deeper profilē groove 16.

According to the invention, this profilē groove 16 is substantially deeper (as seen transversely to the central planē A of the key blade) than a coded recess 17 formed adjacent thereto. The profilē groove 16 is rectilinear and extends along the whole key blade, as appears from Figurē 1, whereas the shallover coded recess 17 in this case constitutes a wave-like groove consisting of coded side recesses 17a, 17b in the key blade immediately above or immediately below the deeper profilē groove 16. 5 !Ι LV 11706

Adjacent to the pointed front end 18 of the key blade 10, the coded groove 17 has a wide insertion portion defined by a straight upper wall portion 19a and a lower, obliquely upwards extending wall portion 19b, said insertion portion being gradually narrover up to a cross sectional planē B, vherefrom the coded groove continues in a wave-like manner with mutually substantially parallel opposite wall portions 20a, 20b exten-ding at a constant distance from each other. The coded groove 17 is relatively shallow, i.e. somevhat less than half the thickness of the key blade 10, and cooperates, upon insertion of the key into the associated lock, with projections 55 extending transversely from side tumblers 54 (cf. Figurēs 3 - 5).

In Figurē 3, there is shown a cross section of the associated cylinder lock 50, which comprises a shell 51, a cylinder key plug 52 rotatably mounted therein and a key Slot 53 extending in the longitudinal direction of the cylinder key plug 52 for receiving the key blade 10.

In the cylinder key plug 52, five of the above mentioned side tumblers 54 are mounted for movement upwards and downwards in respective cavities 58, vhich adjoin to corresponding recesses 56, 57 in the enclosing shell 51. In the position shovn in Figurē 3, the lower end portion of the side tumbler 54 extends into the associated recess 57 and thereby locks the cylinder key plug 52 against rotation in the shell 51.

The above-mentioned, transversely extending projection 55 of the side tumbler 54 is shaped as a pin or tab being elongated vertically and the height of which corresponds to the width of the key code groove 17 between the opposite wall portions 20a, 20b and the width of which (as seen in the planē in Figurē 4) is substantially less than the diameter of the side tumbler 54. The projection 55 is formed on an adjoining, part cylindrical portion 56' of the side tumbler 54, said part cylindrical portion 56' being guided in a bore 57a adjoining the cavity 58 (see Figurē 4). By this configuration, the side tumbler 54 is nonrotatably guided but is movable vertically or elevationally, so that the projection 55 can be displaced predetermined distances elevationally. 6

II

When the key blade 10 is inserted into the lock 50, the projection 55 of the respective side tumbler 54 will be positi-vely guided in the coded groove 17 of the key blade between the opposite, mutually substantially parallel wall portions 20a, 20b. Compare Figurēs 1 and 5. When the key has been fully inserted, each side tumbler 54 assumes a predetermined vertical position, which permits rotation of the cylinder key plug 52 vithin the shell 51, as illustrated in Figurē 5.

According to the present invention, the cylinder key plug 52 of the lock has a side profilē ridge 60, which projects transversely into the key slot 53. In the region of the respective projection 55 of each side tumbler 54, the side profilē ridge 60 has a recess 61, which is dimensioned so as to permit the projection 55 to move freely upwardly and downwardly in relation to the side profilē ridge 60. The side profilē ridge 60 projects so far into the key slot 53, i.e. transversely past the projections 55, that it has a remaining, continuously extending edge portion 62.

Thus, this unitary edge portion 62 extends continuously along the longitudinal direction of the key slot 53 and consti-tutes a continuous guide and support for the key blade, wherein the edge portion 62 fits into the deepest portion of the side profilē groove 16 of the key adjacent to the bottom 16a thereof (see Figurē 2) .

The second embodiment illustrated in Figurēs 6-10, where corresponding parts have the same reference numerals with the digit 1 added thereto, differs from the preceaing embodiment in that the rectilinear profilē groove 116 of the key blade is undercut at the lower surface 116b thereof. In this case, the profilē groove is widened towards the bottom 116a of the groove. The side profilē ridge of the key plug 152 is correspondingly provided with a downwardly projecting tongue 162a, which will fill up the undercut portion of the profilē groove 116 upon insertion of the key blade (Figurē 9). In this way, apart from obtaining good guidance of the key, the securi-ty against picking will be further enhanced, because the con-tinuously extending portion 162, 162a of the profilē ridge has 7 LV 11706 a greater vertical extension and will thus make it even more difficult to manipulate the tumblers through the key slot 153.

The coded recess 117 also differs from the preceding embodiment in that the upper groove wall 120a is straight, vhereas the lower groove wall 120b forms a vave-like guiding surface. The side tumbler 154 is in this case spring-biassed vertically downwards by means of an upper pin 156a (in the corresponding cylinder bore), and the projection 155, which in this case is substantially cylindrical and therefore has a smaller vertical extension, contacts the groove wall 120b resiliently when the key blade is inserted into the lock.

The side tumblers may alternatively be oriented obliquely or perpendicularly in relation to the key slot and may co-operate, with an end portion, directly with the coded recess of the key. In such a case, the side tumblers may be, e.g., cylindrical and being vithout any projections extending trans-versely from the cylindrical surface.

It is contemplated that numerous modifications may be made to the cylinder lock and key of the present invention vithout departing from the spirit and scope of the invention as defined in the following claims. II. LV 11706 CLAIMŽj o 1. A cylinder lock and key combination, wherein the lock (50) comprises: a shell (51); a cylinder key plug (52) rotatably mounted in said shell and including at least one cavity (58) therein; a substantially flat key slot (53) extending longituai-nally in said cylinder kev plug for receiving said key; at least one side profilē tongue (60) disposed in said cylinder key plug and projeccir.g transversely into said key slot; and at least one side tumbler (54) which is movably mounted in an associatea cavity (58) in said cylinder kev plug and co-operates with said kev, said side tumbler being movable verti-callv or obliquelv when the key is inserted into said kev slot, said cavity (58) communicating v;ith said key slot (53) via an adjoinir.g recess (61) in said profilē tongue (60), said recess (61) being dimensioned to accommodate a projection (55) of said side tumbler (54) while permitting said vertical or oblique movement thereof; and wherein said key comprises: an elongated, substantially flat key blade extending between two planar side surfaces (11,12), said key blade being insertable into said key slot and having at least one rec-tilinear side profilē groove (16) corresponding to said side profilē tongue and extending along an entire lengt’n of said key blade in one of said planar side surfaces; an elongated, longitudinally extending wave-like key code groove in said one side surface adjacent to said side profilē groove, said wave-like key code groove (17a,17b) cooperating with said side tumbler projection (55) and causing the latter to move vertically or obliquely upon insertion of said key into said key slot of said cylinder lock; characterized in that said side profilē groove (16) of said key blade is substantially aeeper than said wave-like key code groove (17) adjacent thereto, the depth being calculated 9 transversely to said one side surface ana cne aeepest portion thereof serving as a guiding bottom portion (16a); said profilē tongue has a continuously extending, unitary edge portion (62) serving to guide and support said key blade, upon insertion thereof into said key slot, while engaging with said guiding bottom portion (16a) of said side profilē groove (16); and said recess (61) in said profilē tongue (60) is located transversely inside said unitary edge portion (62) so as to protect said side tumbler projection (55) against manipulation and to permit movement of the same verti-cally or obliquely t'nerein when inserting said key blade into said key slot of the lock. 2. The combination according to claim 1, wherein said recess (61) in said profilē tongue (60) extends into openings upwards and downwards into said key slot (53). 3. The combination according to claim 1 or 2, v/herein the profilē groove of the kev is unaercut at at least one groove surface, wherein said profilē tongue of said cylinder lock has a portion corresponding to the unaercut portion of the profilē groove. 4. The combination according to any one of claims 1-3, wherein said side tumbler is spring biassed in said cavity, said projection of said side tumbler cooperating with said key code groove above or below said profilē tongue of said cylinder lock. 5. The combination according to claim 1, wherein said side tumbler is freely movable elevationally in said cavity, said projection of the side tumbler being positively guided in said key code groove. 6. A kev included in a combination according to claim 1, comprising: 10 u LV 11706 an elongated, substantially flat key blade (10), ex-tending between two planar side surfaces (11,12), said key blade being adapted to be inserted in a key sloc of a lock and having at least one rectilir.ear side profilē groove (16) corresponding to a side profilē tongue (60) projecting into the key slot of the lock and extending along an entire length of said key blade in one of said planar side surfaces; and an elongated, longitudinally extending wave-like kev ccde groove in said one planar surface adjacent to said side profilē groove, said wave-like key code groove (17) being adapted to cooperate with a projection (55) of a side tumbler (54) in the lock upon insertion of the key in the key slot of the lock, wherein said side profilē groove (16) of said key is substantially deeper than said v/ave-like key code groove (17) adjacent thereto, the depth being calculated trans-versely to said one side surface and the deepest portion thereof serving as a guiaing bottcm portion (16a) for guiding the key blade while engaging with a continuously extending, unitary edge portion (62) of said side profilē tongue. 7. The key according to claim 6, wherein said wave-like key code groove (17) adjoins the deeper side profilē groove (16) at the upper and/or lower side thereof. 8. The key according to claim 6, wherein said wave-like key code groove (17) has opposite, mutuallv substantially parallel groove walls (20a, 20b), between which the projection (55) of the side tumbler (54) is positivelv guided upon insertion of said key into the lock, and wherein a width of the wave-like key code groove (17), which is defined by a distance between said opposite groove walls (20a, 20b), is greater than a width of the deeper side profilē groove (16). 11 9. The key according to any one of claims 6-8,wherein said side profilē groove (16) has a substantially rectangular profilē cross section. 10. The key according to any one of claims 6-8, wherein said side profilē groove (116) is undercut at at least one groove surface. 11. The key according to claim 10, wherein said side profilē groove is wiaened inwardly towards the bottom. 12. A key blank for manufacturing a key according to claim 6, said key blank comprising: an elongated, substantially flat key blade (10), ex-tending between two planar side surfaces, said key blade having at least one rectilinear side profilē groove (16) corresponding to a side profilē tongue (60) projecting into a key slot of a lock and extending along an entire length of said key blade, and a solid material region adjacent to said side profilē groove and for cutting in an elongated, longit'jdinally extending wave-like key code groove adapted to cooperate with a projection (55) of a side tumbler (54) in the lock, wherein said side profilē groove (16) is substantially deeper than said adjacent solid material region, the depth being calculated transversely to said one side surface and the deepest portion thereof serving as a guiding bottom portion (16a) for guiding the key blade while engaging with a continuously extending, unitary edge portion (62) of said side profilē tongue. 13. The key blank according to claim 12, wherein said side profilē groove (116) is undercut at at least one groove surface. 14. A lock included in a combination according to claim 1, comprising: 12 !3 LV 11706 a shell (51) ; a cylinder key plug (52) rotatably mounted in said shell; a substantially flat key slot (53) extending longitudi-nallv in said cylinder key plug and aaapted to receive a substantially flat key blade of an associated key; at least one side profilē tongue (60) disposed in the cylinder key plug and projecting transversely into said key slot; and at leasc one side tumbler (54) which is movably rr>ounted in an associated cavity (58) in said cylinder key plug and cooperates with the associated key, said side tumbler being movable vertically or obliquely in relation to said key v/hen the latter is inserted into said key slot, said cavity (58) communicating with said kev slot (53) via an aajoining recess (61) in said profilē tongue (60), said recess (61) being dimensioned to accommodate a projection (55) of said side tumbler (54) while protecting the same against manipulation and permitting said vertical or obliaue movement thereof, vvherein said profilē tongue has a cor.tinuously extending, unitary edge portion (62) serving to guide and support said key blade, upon insertion thereof into said kev slot, while engaging with a bottom portion (16a) of said side profilē groove (16); and wherein said projection (55) of said side tumbler (54) extends transversely into said recess (61) in said profilē tongue (60), and being vertically or obliquely moveable transverselv inside said unitary edge portion when inserting said key blade into said key slot of the lock, while making contact with an elongated, longitudinally extending wave-like key code groove of said key. 15. The lock according to claim 14, wherein said unitary edge portion of the side profilē tongue (16) has a portion corresponding to an undercut portion of the side profilē groove of the key blade.

ABSTRACT A cylinder lock and key combination, wherein the lock comprises a side profilē ridge (60) disposed in the key Slot (53) and having relatively shallow recesses (61), in which a projection (55) on a side tumbler (54) is vertically movable, and a continuously extending edge portion (62). The key has a relatively shallow coded groove (17), which cooperates with the side tumbler projections (55) of the lock, and a rectilinear, deeper profilē groove (16), into which the edge portion (62) of the side profilē ridge fits. This unitary edge portion secures a good guidance of the key when the latter is inserted into the lock.

Claims (15)

ιι. ιι. A combination of a cylindrical lock and a key, wherein the lock (50) comprises: a sheath (51); a cylindrical key core (52) embedded in said casing with the ability to rotate and comprising at least one cavity (58); a substantially flat key slot (53) extending longitudinally into said cylindrical key core for receiving said key; at least one lateral profile insert (60) disposed within said cylindrical key core and extending transversely to said key slot; and at least one side flap (54) movable mounted in said cavity (58) of said cylindrical key core and cooperating with said key, said lateral flap being movable vertically or inclined when said key slot includes a lock, said cavity (58) ) is connected to said key slot (53) through an adjacent recess (61) in said profile tab (60), said recess (61) being of such size as to receive the projection (55) of said lateral flap (54) and to permit said vertical or slanting; and wherein said key comprises: an elongated, substantially flat key plate extending between two flat lateral surfaces (11, 12), said key plate being inserted into said key slot and having at least one rectangular side profile (16) corresponding to said lateral side a profile profile extending along said key plate in one of said flat side surfaces; the longitudinally extending longitudinally wavy key-code groove on one of said lateral surfaces adjacent to said profiled groove, said wavy key code groove (17a, 17b) cooperates with said lateral flange protrusion (55) and causes the latter to move vertically or inclined by inserting said cylindrical locks said key in said key slot; characterized in that said side profile (16) of said key plate is substantially deeper than the adjacent said wavy key code groove (17), the depth being calculated transversely to said one lateral surface and its deepest part serving as a leading base portion (16a); 2: 1 - said profile section has a continuously extended, uniform edge portion (62) serving to guide and support said key plate by inserting it into said key slot until it engages with said leading base portion (16a) of said side profile rib (16) ; and said recess (61) in said profile rail (60) is arranged transversely within said uniform edge portion (62) so as to protect said lateral flange protrusion (55) against manipulation and allow it to move there vertically or inclined when said key plate is slid locks in said key slot. A combination according to claim 1, wherein said recess (61) extends upwardly and downwardly in said profile gap (53) in said profile rail (60). The combination according to claim 1 or 2, wherein the key profile is cut into at least one groove surface, wherein said cylindrical lock profile portion has a portion corresponding to the cut portion of the profile strip. The combination according to any one of claims 1 to 3, wherein said lateral flap with a spring is directed into said cavity, said protrusion of said side flap cooperating with said key code groove above or below said cylindrical lock profile profile. 5. The combination according to claim 1, wherein said lateral flap is freely movable in said cavity, said protrusion of the lateral flap is necessarily inserted into said key code slot. 6. The key in combination according to claim 1 comprises: - a long, substantially flat key plate (10) extending between two flat lateral surfaces (11,12), said key plate being suitable for insertion into a lock key slot and has at least one rectangular side profile rib (16) corresponding to a side profile (60) which extends into the lock key gap and extends along said key plate in one of said flat side surfaces; and - a long, longitudinally oriented wavy key-code groove in one of said lateral surfaces adjacent to said profiled groove, said waveguide 3 I 3 I EN 11706 key code (17) is suitable for cooperating with the protrusion (55) in the lock by inserting the key lock in the key slot; wherein said side profile (16) of said key is substantially deeper than the adjacent said wavy key code groove (17), the depth being calculated transversely to said one lateral surface, and its deepest part serving as a key plate (16a) key plates for driving at the time of engagement with the continuously extended, single edge portion (62) of said side profile. The key according to claim 6, wherein said wavy key code groove (17) contacts the deepest side profile groove (16) on its upper and / or lower side. The key according to claim 6, wherein said wavy key code groove (17) has opposing, substantially mutually parallel, groove walls (20a, 20b) between which a projection (55) of the lateral flap (54) is guided by inserting said key in the lock, and wherein the width of the wavy key code groove (17) determined by the distance between said opposite groove walls (20a, 20b) is greater than the width of the deepest side profile rib (16). The key according to any one of claims 6 to 8, wherein said side profile rail (16) is substantially a cross-section of a rectangular profile. A key according to any one of claims 6 to 8, wherein said side profile groove (116) is cut into at least one groove surface. 11. The key according to claim 10, wherein said side profile is extended inwardly towards the base. A key pad for producing keys according to claim 6, wherein said key blade comprises; - an elongated, substantially flat key plate (10) extending between two flat lateral surfaces, said key plate having at least one rectangular side profile (16) corresponding to a side profile (60) which extends into the lock key gap and extends throughout along the length of said key plate, and 4 II. - an area of solid material adjacent to said side profile rail for engaging an elongated, longitudinally oriented wavy key code slot suitable for cooperating with the projection (55) of the lateral flap (54) in the lock, wherein said side profile groove (16) is substantially deeper than the adjacent said solid material area, the depth being calculated transversely to said one lateral surface, and its deepest part serving as a guiding base (16a) to guide the key plate while engaging with said side profile strut continuously stretched, single edge portion (62). 13. A keypad according to claim 12, wherein said side profile groove (116) is cut into at least one groove surface. 14. The lock in combination according to claim 1 comprises: a sheath (51); a cylindrical key core (52) fixed in said housing with the possibility of rotating; a substantially flat key slot (53) extending longitudinally into said cylindrical key core and being adapted to receive a key of the corresponding key in a flat key plate; at least one lateral profile insert (60) disposed in the core of the cylindrical key and extending transversely to said key slot; and at least one side flap (54) movable mounted with said cylindrical key core in the associated cavity (58) and cooperating with the corresponding key, said lateral flap being movable vertically or inclined relative to said key when the latter is inserted into said key slot; said cavity (58) is connected to said key slot (53) through an adjacent recess (61) in said profile tab (60), said recess (61) being of such size as to accommodate the projection (55) of said lateral flap (54) securing it against manipulation and allowing its said vertical or biased movement, wherein said profile piece has a continuously extended, uniform edge portion (62) serving to guide and support said key plate by inserting it into said key slot while it engages said leading base portion (16a) of said side profile strip (16); and said protrusion (55) of said lateral flap (54) transversely extends into said recess (61) of said side profile (60) and is vertically or inclined to be moved transversely within said portion of said uniform edge when said key plate is inserted into said lock plate 5 in the keyway gap when contacting the longitudinal, longitudinally directed wavy key code groove of said key. A lock according to claim 14, wherein said side edge portion (16) of said single edge portion has a portion corresponding to the cut portion of the side plate 10 of the key plate.